A circle has diameter = 20
Calculate Area, Circumference, Radius, Diameter
Calculate radius (r):
d = 2r
Rearranging the equation, we get:
| r = | d |
| 2 |
| r = | 20 |
| 2 |
r = 10
Calculate circumference (C):
C = 2πr
C = 2π * 10
C = 20π or 62.8319
Calculate Area (A):
A = πr2
A = π * 102
A = 100π or 314.1593
Final Answers
r = 10
C = 20π or 62.8319
A = 100π or 314.1593
C = 20π or 62.8319
A = 100π or 314.1593
Common Core State Standards In This Lesson
7.G.B.4
What is the Answer?
r = 10
C = 20π or 62.8319
A = 100π or 314.1593
C = 20π or 62.8319
A = 100π or 314.1593
How does the Circles Calculator work?
Free Circles Calculator - Calculates and solves for Radius, Diameter, Circumference, and Area of a Circle.
This calculator has 1 input.
This calculator has 1 input.
What 3 formulas are used for the Circles Calculator?
d=2r
A = 2πr2
C=2πr
A = 2πr2
C=2πr
What 7 concepts are covered in the Circles Calculator?
- area
- Number of square units covering the shape
- circle
- the set of all points in the plane that are a fixed distance from a fixed point
- circles
- circumference
- the perimeter of a circle or ellips
- diameter
- distance from two endpoints of a circle through the center
d = 2r - origin
- On a two digit coordinate plane, the point (0, 0), where the x-axis and y-axis cross.
- radius
- Distance from the center of a circle to the edge
C/2π
Example calculations for the Circles Calculator
- Circle radius = 2
- Circle diameter = 2
- Circle area = 2
- Circle circumference = 2
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- Circle diameter = 3
- Circle area = 3
- Circle circumference = 3
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- Circle circumference = 4
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- Circle radius = 10
- Circle diameter = 10
- Circle area = 10
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- Circle diameter = 11
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- Circle diameter = 12
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- Circle circumference = 12
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- Circle diameter = 13
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- Circle diameter = 17
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- Circle radius = 18
- Circle diameter = 18
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- Circle circumference = 18
- Circle radius = 19
- Circle diameter = 19
- Circle area = 19
- Circle circumference = 19
- Circle radius = 20
- Circle diameter = 20
- Circle area = 20
- Circle circumference = 20
